I have to comment on the HInts to home builders video on tie down ropes.
Types of rope: Polypropylene, nylon and cotton ?! >> Polypropylene, nylon and polyester - finding cotton today will be difficult. And there are many hi-tech lines on the market as well.
polyester aka dacron: very low stretch - use yacht braid (double braid) fairly long life in UV and dirt. > 10 years outside
nylon: relatively high stretch - comes in a laid line ( 3 strands twisted) & yacht braid. laid line more stretchy. Braid better behaved when handling. and has longer life in the outdoors. near equal to polyester for lifespan
Polypropylene: In the marine world we use this line for it's high visibility and floating characteristics - only. Polypro is extremely sensitive to UV - loosing 50% of line strength in one season. IT IS 1/2 THE STRENGTH OF POLYESTER AND EVEN LESS FOR NYLON It is also generally very slippery - allowing knots to slip. It has one thing going for it... it's really cheap. 1/3 the cost of the other two. For airports to use this line at the tie downs is a set up for failure and much grief. Using this line for your aircraft tie down lines is a choice. Nylon - use a smaller lighter line It's your choice.
Newer ropes involve some exotic materials but the line strength goes way up. Samson ropes AS90, 1/4" line has a break load of 9700 pounds. Cheap like polypro? no, about $2.25/ft. There are others that are a bit less leading edge and more reasonable - with ratings well past that Homer Brand polypropylene. Space and weight are always serious considerations in aviation.
Samson "super strong" nylon braid 1/4" 2,300 pounds. ~$0.35/ft
Cutting the line and finishing the ends - all the synthetic lines have a melt temperature and will fuse the ends. Here is an easier way. Use paper tape wrap where you want to cut and melt. Cut through the taped line with a sharp utility knife or single edge raiser blade. You now have two ends taped and ready to melt. Now with the tape still on - melt the ends. I use the electric stove as it has no open flame. Peel the tape.